I'm a former landlord (20 years worth until 1998) and I've been answering landlord tenant questions on legal websites for almost 15 years.
I've read a lot of posts from clueless landlords and the trouble they've gotten themselves into.
I can't imagine why your landlord is doing this but it's unlikely that the eviction will hold up in court without the proper notice.
If you have some time and want to do some research, check your county assessor website for the actual owner's name and building details. Then go to the county recorder's website and look up the owner's recorded documents for that property. That gives you the deed history and any loan documents. Check the property tax agency website and see if the taxes are up to date or in default. Check with the city code department to see if there are any violations pending. Same with county zoning. Google the property address and see if it's up for sale.
You might also talk to your neighbors and see if anybody else in the building got the same thing.
Be sure to update this thread with progress reports. We like reading this stuff.

